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Note I connected this much later, hence why I have something underneath to catch water. Working on the Waste Pipe
However, it's vital that you use a jubilee clip and screw it tight with a screwdriver. This ensures it doesn't come off.If you have a pop-up bathroom sink stopper (which is the case with most bathroom sinks), you will first need to remove the stopper before you can remove the flange. This is actually a really simple task so let is get down to it. If your P-trap is made of PVC, the connections will be hand tight hence no need to use a wrench. A metallic drainpipe with a metallic will need an adjustable wrench to loose. The only thing that worked, was putting pressure against the plug with my fingers, while the sink filled up. When the sink was ¾ full, I could release my fingers and the plug would seal. I didn’t want to have to do this every time I filled the sink though. Disconnect the pivot rod from the drainpipe. If the connection is not hand tight you can use a wrench. Pull it out to free the stopper. The reason our sink plugs wouldn’t hold water was because the rubber washer underneath needed to be replaced. You can pull apart the plug by untwisting the middle handle part, which allows you to replace the rubber washer underneath. This is the seal that allows the plug to stop water going down the drain. It didn’t matter how I contorted the washer, the plugs wouldn’t keep the water in.
For seals that last a lifetime, try UniBond Triple Protection Anti-Mould Sealant. It was voted “best in class” for anti-mould protection in independent tests, and comes with a staggering 35 year guarantee. You may never have to reseal the kitchen sink again! Just like with the kitchen sink flange, apply a good size of plumber’s putty or silicone caulk bead under the rim of the flange.Clean the area. Avoid exposing the surface to water. Spray a cloth or paper towel with household cleaner and clean the area. Wipe dry. Then clean again with bleach, before rinsing and leaving to dry. First, just for demonstration purposes, here's the bottom drain section. The pipe ideally should aim towards the overflow drain (as above).